@GiantGuy:
I don't think we'll se a Davy Back Fight again, but if we does I don't think it'll be similar to the one with Foxy. IMO there's very much that indicates that all the games in the Foxy vs. Straw Hat crew were decided by the Foxy crew. I mean:
- Donut Race would take years if the game took place in e.g. Alabasta but it was fine on Longring Longland.
- The Groggy Monsters were giant and as such they were perfect ballmen in Groggy Ring. A crew with only normal-sized isn't that effective in Groggy Ring.
- Foxy's ship were perfectly designed for a one-on-one-battle.
If the Straw Hats meet new opponents in a Davy Back Fight, they'll surely have prepared games that advantage their strengths.
Sure, maybe the existing games will change and some new games may be introduced, but I cannot imagine another Davy Back Fight because it will only be a mini arc if it appears like last time, which means it's likely that the arc will be a set up for a big arc. Some examples of 'set-up' arcs include, Jaya arc, Shabondy arc, and Foxy arc. That is why I cannot believe in this theory.
Even if the opponent team changes, it sure will be boring simply because we already know about the game. There are more new things that will be introduced as some of them are foreshadowed. Some mysteries include the other two Yonkous, the meaning of Five Star Elders, more Poneglyph, meeting Shanks, etc.
I can see Oda using a existing character for another arc like in Impel Down and the current arc, but using the existing idea? Not gonna happen yo.